.ab-center{
  position: absolute;
  top:50%;
  left: 50%;
  transform: translate(-50%);
}
.ab-h-center{
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.ab-v-center{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

.after-nav-content{
  height: calc( var(--app-height) - 50px);
  overflow: auto;
}
.expand-box{
  position: absolute;
  top:0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow: auto;
}
